Article (Scientific journals)
CO2 and CH4 in sea ice from a subarctic fjord under influence of riverine input
Crabeck, O.; Delille, Bruno; Thomas, David et al.
2014In Biogeosciences, 11 (23), p. 6525-6538
Peer Reviewed verified by ORBi
 

Files


Full Text
Crabeck et al 2014 BG.pdf
Publisher postprint (3.05 MB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Abstract :
[en] We present the CH4 concentration [CH4], the par- tial pressure of CO2 (pCO2) and the total gas content in bulk sea ice from subarctic, land-fast sea ice in the Kapisillit fjord, Greenland. Fjord systems are characterized by freshwater runoff and riverine input and based on $\delta$18O data, we show that >30\% of the surface water originated from periodic river input during ice growth. This resulted in fresher sea-ice layers with higher gas content than is typical from marine sea ice. The bulk ice [CH4] ranged from 1.8 to 12.1 nmolL−1, which corresponds to a partial pressure ranging from 3 to 28ppmv. This is markedly higher than the average atmo- spheric methane content of 1.9ppmv. Evidently most of the trapped methane within the icewas contained inside bubbles, and only a minor portion was dissolved in the brines. The bulk ice pCO2 ranged from 60 to 330ppmv indicating that sea ice at temperatures above −4 ◦C is undersaturated com- pared to the atmosphere (390 ppmv). This study adds to the few existing studies of CH4 and CO2 in sea ice, and we con- clude that subarctic seawater can be a sink for atmospheric CO2, while being a net source of CH4.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Crabeck, O.
Delille, Bruno  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique
Thomas, David
Geilfus, N.-X.
Rysgaard, S.
Tison, J.-L.
Language :
English
Title :
CO2 and CH4 in sea ice from a subarctic fjord under influence of riverine input
Publication date :
2014
Journal title :
Biogeosciences
ISSN :
1726-4170
eISSN :
1726-4189
Publisher :
Copernicus GmbH
Volume :
11
Issue :
23
Pages :
6525-6538
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 20 January 2015

Statistics


Number of views
133 (1 by ULiège)
Number of downloads
116 (1 by ULiège)

Scopus citations®
 
16
Scopus citations®
without self-citations
6
OpenCitations
 
16

Bibliography


Similar publications



Contact ORBi